CAUTION: This is a NO POWER Static Test Procedure. Verify Power has been removed from the VFD for at least 5 minutes prior to proceeding!

Purpose: Provide a safe no power Step-by-Step instructions on how to determine if a ACH550’s input diode(s) or output transistor(s) have failed. These components may have failed if the drive input fuses or circuit breaker opened, or the drive keypad displays a fault such as Ground Fault, Short Circuit, or Overcurrent. Test results are based on using a diode ( ) setting on a multi-meter.

Table 1: Drive Identification

Voltage Drive Model Number HP Power TerminalFigures

200/240 ACH550-UH-04A6-2 thru -031A-2 1-10 1, 2

ACH550-UH-046A-2 thru -114A-2 15-40 1

ACH550-UH-143A-2 thru -248A-2 50-100 3

460/480 ACH550-UH-03A3-4 thru -023A-4 1-15 1, 2

ACH550-UH-031A-4 thru -097A-4 20-75 1

ACH550-UH-125A-4 thru -246A-4 100-200 3

575/600 ACH550-UH-02A7-6 thru -017A-6 2-15 1, 2

ACH550-UH-022A-6 thru -062A-6 20-0 1

ACH550-UH-077A-6 thru -144A-6 75-150 3

Figure 1

Power Output to MotorPower Input(U1, V1, W1) (U2, V2, W2)

Frame Terminal Brake Options Size Labels R1, R2 BRK+, BRK- Brake resistorR3, R4 UDC+, UDC- Braking unit

Chopper and resistor

Optional Braking

Figure 3

GND

Power input

PE

(U1, V1, W1)

Optional brakingFrame size

Terminal labels Brake options

R5, R6 UDC+, UDC- • Braking unit • Chopper and resistor

Power input

PE

(U1, V1, W1)

Power output to motor(U2, V2, W2)

GND

GND

Power output to motor(U2, V2, W2)

Figure 2

OR

Step 1: Verify power has been removed from the drive for at least 5 minutes.Step 2: Identify the drive you will be testing in Table 1, using the drive model number located on the drive rating label (nameplate).

Step 3: Identify and familiarize yourself with the specific terminal locations for the drive selected in Step 2 using the designated figure(s) in Table 1. Note that some connections (-UDC) may not be terminals.

ACH550 No Power Test ProcedureTo Check Input Diodes and Output Transistors

AC

H55

0-P

NP

T24U

-EN

RE

VA

Effe

ctiv

e: 0

6/01

/201

5

NOTE: If you have a drive indicated in the table below, complete Step 7, otherwise proceed to conclusion:

Step 7: To check the brake circuit diodes place the multi-meter probes (positive and negative leads) on the indicated terminal pair locations listed in Test 3 and record your results for each brake circuit being measured.

Conclusion: Test results showing 0.0 Vdc instead of ~0.4 Vdc indicate a shorted drive component. Test results showing OL instead of ~0.4 Vdc indicate an open circuit. In either case of an open or shorted circuit, the drive has a failed component and either needs to be repaired or replaced.

Contact ABB Technical Support at 1-800-752-0696 or your local ABB representative.

Step 4: Set your multi-meter to the Diode setting.

Step 5: To check the input bridge diodes place the multi- meter probes (positive and negative leads) on the indicated terminal pair locations listed in Test 1 and record your results for each input bridge diode being measured.

Step 6: To check the output transistors (IGBTs) place the multi-meter probes (positive and negative leads) on the indicated terminal pair locations listed in Test 2 and record your results for each output transistor circuit being measured.

Test 1: Input Diode Bridge Cicuit

Meter + Probe Terminal

Meter (-) Probe Terminal

Expected Results*

Diode Being Measured

Your Results

U1 +UDC/R+ ~0.4 U1 Upper

V1 +UDC/R+ ~0.4 V1 Upper

W1 +UDC/R+ ~0.4 W1 Upper

-UDC U1 ~0.4 U1 Lower

-UDC V1 ~0.4 V1 Lower

-UDC W1 ~0.4 W1 Lower

U1 -UDC OL U1 Lower

V1 -UDC OL V1 Lower

W1 -UDC OL W1 Lower

+UDC/R+ U1 OL U1 Upper

+UDC/R+ V1 OL V1 Upper

+UDC/R+ W1 OL W1 Upper

Test 3: Brake Chopper Circuit

Meter + Probe Terminal

Meter (-) Probe Terminal

Expected Results*

Diode Being Measured

Your Results

+UDC/

BRK+BRK- OL BRK Diode

BRK-+UDC/

BRK+~0.4 BRK Diode

BRK- -UDC OLBRK

Transistor

NOTES:

*Results may range from 0.4 - 0.7 depending on drive size and meter being used. Looking for consistency in results for all input diode bridge tests, and output transis-tors respectively to determine if component is functional. **The process of checking the output transistors is to measure the fly-back diode in parallel to the transistor. In almost all scenarios of the failure of the transistor it will cause either a shorting, or opening of the fly-back diode.

Test 2: Ouput Transistor (IGBT) Circuit

Meter + Probe Terminal

Meter (-) Probe Terminal

Expected Results*

Diode Being Measured

Your Results

U2 +UDC/R+ ~0.4 U2 Upper

V2 +UDC/R+ ~0.4 V2 Upper

W2 +UDC/R+ ~0.4 W2 Upper

-UDC U2 ~0.4 U2 Lower

-UDC V2 ~0.4 V2 Lower

-UDC W2 ~0.4 W2 Lower

U2 -UDC OL U2 Lower

V2 -UDC OL V2 Lower

W2 -UDC OL W2 Lower

+UDC/R+ U2 OL U2 Upper

+UDC/R+ V2 OL V2 Upper

+UDC/R+ W2 OL W2 Upper

Voltage Drive Model Number HP

200/240 ACH550-UH-04A6-2 thru -031A-2 1-10

460/480 ACH550-UH-03A3-4 thru -023A-4 1-15

575/600 ACH550-UH-02A7-6 thru -017A-6 2-15

For more information please contact: ABB Inc.Discrete Automation & MotionDrives and ControlsNew Berlin, WI 53151Ph: (800) 752-0696

www.abb.com/drives

© Copyright 2015 ABB. All rights reserved. Specifications subject to change without notice